Chapter 4 Integumentary System Lawson 2012

Chapter 4 Integumentary System Lawson 2012 - Integumentary...

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Integumentary System Chapter 4 Craig Lawson, MD Schwitalla Hall, M406 lawsoncl@slu.edu
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Integumentary System OBJECTIVES Be able to list the functions of the skin Be able to compare/contrast the structure of the epidermis and dermis Be able to briefly describe the layers present in either thick or thin skin Be able to list the 4 types of cells present in the epidermis and give their function Be able to compare the different types of glands associated with the skin
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Integumentary System FUNCTIONS Physical protection from environmental hazards Thermoregulation Excretion Synthesis/storage of lipid reserves Synthesis of vitamin D3 Provides sensory information Coordinates immune response to pathogens and malignancies of the skin
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Integumentary System
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Integumentary System The skin is defined as a cutaneous membrane that covers the entire body and meets the mucous membranes of other systems (respiratory, digestive, reproductive, urinary) The skin consists of two parts: epidermis and dermis Epidermis, a stratified squamous epithelium containing cells that eventually undergo a process called keratinization Dermis, a layer of connective tissue under the epidermis
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Integumentary System
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Integumentary System
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Integumentary System The Epidermis – Can be present as thick or thin skin – Thick skin has 5 layers and is found on the palms of the hands and soles of the feet – Thin skin has only 4 layers…the stratum lucidum is missing and is found every where else on the body
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Integumentary System Layers or strata of the epidermis Stratum corneum, has basket-weave pattern Stratum lucidum, a clear layer, hard to see cells, present only in thick skin Stratum granulosum, keratohyaline granules appear Stratum spinosum, cells have spiny edges Stratum germinativum or stratum basale, (1 cell thick) -Mitosis of basal cells occurs in this layer -Produces new keratinocytes (that will become keratinized)
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Integumentary System Thick and thin skin What do they look like?
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Integumentary System
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Integumentary System Four cell types in epidermis Keratinocytes: found in all layers, most abundant cell in epidermis, eliminate all organelles and
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This note was uploaded on 03/27/2012 for the course HEALTH 350 taught by Professor Cooper during the Spring '12 term at MO St. Louis.

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Chapter 4 Integumentary System Lawson 2012 - Integumentary...

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